U.S. Attorney General Jeff Sessions appointed Timothy Garrison as interim U.S. attorney for the Western District of Missouri.

Garrison, who’s worked as assistant U.S. attorney in the district’s Springfield office since 2007, moves into the interim role today, according to a news release.

Don Ledford, spokesman for the U.S. attorney’s office, said Garrison primarily will work out of the district’s main office in Kansas City. Garrison takes over for Tom Larson, who had served as acting U.S. attorney for the Western District since March. Former Western District U.S. Attorney Tammy Dickinson was among 46 U.S. attorneys asked to resign by Sessions that month. Larson returns to his position of first assistant U.S. attorney for the Western District, Ledford said.

“We are still waiting for an official nomination from the president to be submitted to the U.S. Senate for confirmation,” Ledford said of Garrison.

A current lieutenant colonel in the Marine Corps Reserve, Garrison also previously served as a prosecutor in the Marine Corps.

The U.S. attorney’s office for the Western District covers 66 of the state’s 114 counties, including the Springfield metropolitan statistical area. The office has both a civil and criminal division, according to its website.